Device for measuring speed of motor vehicle

The utility model discloses a device for measuring the speed of a motor vehicle, and the device comprises a supporting rod which is arranged above a road surface and parallel to the road surface along the extending direction of a road; two range sensors which are respectively fixed at two ends of the supporting rod; and a control element which is fixedly disposed on the supporting rod between the two range sensors. An electric level signal feedback line for the feedback of an electric feedback signal, a common ground line and a control signal line are disposed between the range sensors and a control element. The range sensors collect the distance information between the range sensors and the road surface. The control element calculates the speed value of the motor vehicle according to distance data signals transmitted by the two range sensors. The device achieves the measurement of the speed of the motor vehicle through the range sensors and the control element, avoids a radar apparatus, is prevented from being found by a driver in advance, and facilitates the achievement of the management of the speed of the motor vehicle.